hdb: Avoid passing a NULL pointer to strcmp()

To do so is to invoke undefined behaviour.

Signed-off-by: Jo Sutton <josutton@catalyst.net.nz>

diff --git a/lib/hdb/common.c b/lib/hdb/common.c
index e2d12823dab8449ca39b4e078110d6e7cce6d9bd..3b8c7c5f7b694797d63fa17011e5a3430beb9a6c 100644 (file)
--- a/lib/hdb/common.c
+++ b/lib/hdb/common.c
@@ -1616,7 +1616,7 @@ fetch_it(krb5_context context,
     if (!db->enable_virtual_hostbased_princs)
         maxdots = mindots = 0;
     if (db->enable_virtual_hostbased_princs && comp1 &&
-        strcmp("krbtgt", comp0) != 0 && strcmp(KRB5_WELLKNOWN_NAME, comp0) != 0) {
+        (comp0 == NULL || (strcmp("krbtgt", comp0) != 0 && strcmp(KRB5_WELLKNOWN_NAME, comp0) != 0))) {
         char *htmp;
 
         if ((host = strdup(comp1)) == NULL)